Question

Question 2 The pathway taken by a molecule of CO2 from the atmosphere to the site of photosynthesis is:
(a) Stomatal aperture, intercellular space, mesophyll cell wall, chloroplast. (b) Stomatal aperture, epidermal cell, mesophyll cell, chloroplast.
(c) Stomatal guard cell, intercellular space, mesophyll cell membrane, chloroplast. (d) Stomatal guard cell, intercellular space, phloem sieve tube, chloroplast. spongy mesophyll cell,​

Answer 1

Answer:

Option (A) Stomatal aperture, intercellular space, mesophyll cell wall, chloroplast is the correct answer.

According to question, here we have to elaborate the CO2 fixation when it enters from atmosphere to the site of Photosynthesis which pathway is taken by CO2.

As, the CO2 fixation pathway is asked hence the CO2 fixation when it enters the Calvin cycle needs to be discussed here to get the exact pathway of fixation at the site of photosyntheis.

Explanation:

Firstly, we need to understand and elaborate-CO2 fixation.

CO2 FIXATION

• CO2 fixation is carbon dioxide fixation also known as CO2 assimilation.This process is performed in Photosynthesis.
• Under photosynthesis CO2 fixation takes place under Dark reaction. Therefore, we need to remember CO2 fixation actually occurs under Calvin cycle.

Calvin cycle comprises of 3 steps:-

1. Fixation
2. Reduction
3. Regeneration

• Further on discussing CO2 fixation in Calvin cycle.
• CO2 fixation or CO2 assimilation :- It is a conversion process under this Inorganic Carbon is converted in Organic carbon or Ognaic compound. This process occurs through living organism or living part of plant. Therefore, this process actually occurs in Chloroplasts.

In the depth of Chloroplast, the pathway of occurence is as follows-

1st) goes to- STOMATAL APERTURE.

                       ↓

2nd) then there is involvement of - INTERCELLULAR SPACE.

                       ↓

3rd) Then involvement of - MESOPHYLL CELL WALL.

                       ↓

4th) At the end, it gets completed at - CHLOROPLASTS.

Therefore, CO2 fixation pathway under Calvin cycle at the site of Photosynthesis is-

STOMATAL APERTURE → INTERCELLULAR SPACE → MESOPHYLL CELL WALL →CHLOROPLAST.

⇒ Hence, Option (a) Stomatal aperture, intercellular space, mesophyll cell wall, chloroplast is the correct answer.

Explainations for incorrect options-

Option (b) Stomatal aperture, epidermal cell, mesophyll cell, chloroplast is the Incorrect answer as there is no involvement of Epidermal cell in the pathway.

Option (c) Stomatal guard cell, intercellular space, mesophyll cell membrane, chloroplast is the Incorrect answer as there is no involvement of Stomatal guard cell in the pathway.

Option (d) Stomatal guard cell, intercellular space, phloem sieve tube, chloroplast. spongy mesophyll cell is the Incorrect answer as there is no involvement of Stomatal guard cell,  phloem sieve tube, spongy mesophyll cell in the pathway.

                                                                                                                             

Answer 2

The pathway taken by a molecule of CO2 from the atmosphere to the site of photosynthesis is Stomatal aperture, intercellular space, mesophyll cell wall, chloroplast is the correct answer.

CO2 FIXATION

CO2 fixation is carbon dioxide fixation also known as CO2 assimilation. This process is performed in Photosynthesis.

Under photosynthesis CO2 fixation takes place under Dark reaction. Therefore, we need to remember $\mathrm{CO} 2$  fixation actually occurs under Calvin cycle.

Calvin cycle comprises of 3 steps:-

• Fixation

• Reduction

• Regeneration

CO2 fixation or $\mathrm{CO} 2$ assimilation :- It is a conversion process under this Inorganic Carbon is converted in Organic carbon or Organic compound. This process occurs through living organism or living part of plant. Therefore, this process actually occurs in Chloroplasts.

In the depth of Chloroplast, the pathway of occurrence is as follows-

1st) goes to- STOMATAL APERTURE.

2nd) then there is involvement of - INTERCELLULAR SPACE.

3rd) Then involvement of - MESOPHYLL CELL WALL.

4th) At the end, it gets completed at - CHLOROPLASTS.

Therefore, $\mathrm{CO} 2$ fixation pathway under Calvin cycle at the site of Photosynthesis is-

STOMATAL APERTURE $\Rightarrow$ INTERCELLULAR SPACE $\Rightarrow$ MESOPHYLL CELL WALL $\Rightarrow$ CHLOROPLAST.

Hence, Option (a) Stomatal aperture, intercellular space, mesophyll cell wall, chloroplast is the correct answer.

Learn more about CO2 FIXATION here,

https://brainly.in/question/39874694?msp_poc_exp=1

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